[gnome-shell] appMenu: Only show Open Windows, if there are at least 2 windows

[Marge Bot <marge-bot src gnome org>]

commit fd0da9606fd2481bf67cb488f86d73ab388ff947
Author: Leleat <atule pm me>
Date:   Thu Apr 29 01:09:50 2021 +0200

    appMenu: Only show Open Windows, if there are at least 2 windows
    
    It doesn't make sense to show the 'Open Windows' in the app menu,
    if the app only has 1 open window to switch between. Hide the
    window section in that case.
    
    Fixes https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/4199.
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1827>

 js/ui/panel.js | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
---
diff --git a/js/ui/panel.js b/js/ui/panel.js
index cba32416a2..1474886ef0 100644
--- a/js/ui/panel.js
+++ b/js/ui/panel.js
@@ -30,7 +30,8 @@ class AppMenu extends PopupMenu.PopupMenu {
         this._windowsChangedId = 0;
 
         /* Translators: This is the heading of a list of open windows */
-        this.addMenuItem(new PopupMenu.PopupSeparatorMenuItem(_("Open Windows")));
+        this._openWindowsHeader = new PopupMenu.PopupSeparatorMenuItem(_('Open Windows'));
+        this.addMenuItem(this._openWindowsHeader);
 
         this._windowSection = new PopupMenu.PopupMenuSection();
         this.addMenuItem(this._windowSection);
@@ -118,11 +119,17 @@ class AppMenu extends PopupMenu.PopupMenu {
 
     _updateWindowsSection() {
         this._windowSection.removeAll();
+        this._openWindowsHeader.hide();
 
         if (!this._app)
             return;
 
         let windows = this._app.get_windows();
+        if (windows.length < 2)
+            return;
+
+        this._openWindowsHeader.show();
+
         windows.forEach(window => {
             let title = window.title || this._app.get_name();
             let item = this._windowSection.addAction(title, event => {